active passive buzzer 有/无源蜂鸣器 树莓派3

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蜂鸣器模块原理图

Active vs. Passive Buzzer 有源蜂鸣器内置振荡器，通电就会发出声音。无源蜂鸣器相反，直流电并不能让它发声。无源蜂鸣器，需要使用频率在2k到5k之间的方波来驱动。文章内容有模块原理图，树莓派3接线图，相关代码。

面包板接线图:有源蜂鸣器和无源蜂鸣器一样.

active passive buzzer

有源蜂鸣器SIG接地三极管1和3脚导通,蜂鸣器发出蜂鸣声,声音单一.

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#include <wiringPi.h>
#include <stdio.h>

#define BuzzerPin      0

int main(void)
{
if(wiringPiSetup() == -1){ 
printf("setup wiringPi failed !");
return 1; 
}

pinMode(BuzzerPin,  OUTPUT);

while(1){
digitalWrite(BuzzerPin, HIGH);
delay(100);
digitalWrite(BuzzerPin, LOW);
delay(100);
}

return 0;
}

无源蜂鸣器的SIG脚,根据树莓派3产生的方波,发出蜂鸣声,可发出不同声音.

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#include <wiringPi.h>
#include <softTone.h>
#include <stdio.h>

#define BuzPin    0


#define  CL1  131                                         //低音
#define  CL2  147
#define  CL3  165
#define  CL4  175
#define  CL5  196
#define  CL6  221
#define  CL7  248

#define  CM1  262                                         //中音
#define  CM2  294
#define  CM3  330
#define  CM4  350
#define  CM5  393
#define  CM6  441
#define  CM7  495

#define  CH1  525                                         //高音
#define  CH2  589
#define  CH3  661
#define  CH4  700
#define  CH5  786
#define  CH6  882
#define  CH7  990

int song_1[] = {CM3,CM5,CM6,CM3,CM2,CM3,CM5,CM6,CH1,CM6,CM5,CM1,CM3,CM2,                
CM2,CM3,CM5,CM2,CM3,CM3,CL6,CL6,CL6,CM1,CM2,CM3,CM2,CL7,
CL6,CM1,CL5};

int beat_1[] = {1,1,3,1,1,3,1,1,1,1,1,1,1,1,3,1,1,3,1,1,1,1,1,1,1,2,1,1,
1,1,1,1,1,1,3};


int song_2[] = {CM1,CM1,CM1,CL5,CM3,CM3,CM3,CM1,CM1,CM3,CM5,CM5,CM4,CM3,CM2,
CM2,CM3,CM4,CM4,CM3,CM2,CM3,CM1,CM1,CM3,CM2,CL5,CL7,CM2,CM1
};

int beat_2[] = {1,1,1,3,1,1,1,3,1,1,1,1,1,1,3,1,1,1,2,1,1,1,3,1,1,1,3,3,2,3};

int main(void)
{
int i, j;

if(wiringPiSetup() == -1){ //when initialize wiring failed,print messageto screen
printf("setup wiringPi failed !");
return 1; 
}

if(softToneCreate(BuzPin) == -1){
printf("setup softTone failed !");
return 1; 
}

while(1){
printf("music is being played...\n");

for(i=0;i<sizeof(song_1)/4;i++){
printf("1\n");
softToneWrite(BuzPin, song_1[i]);
printf("2\n");
delay(beat_1[i] * 500);
printf("3\n");
}

for(i=0;i<sizeof(song_2)/4;i++){
printf("a\n");
softToneWrite(BuzPin, song_2[i]);
printf("b\n");
delay(beat_2[i] * 500);
printf("c\n");
}
}

return 0;
}

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